Heath Borders hborders

hborders / Example.h

Last active March 13, 2017 16:42

An Objective-C pattern for making sum types - Example.h

	#import <Foundation/Foundation.h>

	@class ExampleFoo;
	@class ExampleBar;

	@interface Example : NSObject
	// notice there is no public designated initializer, so consumers can't instantiate Example directly.
	// They must instantiate a subclass.
	+ (instancetype _Nonnull)new NS_UNAVAILABLE;
	- (instancetype _Nonnull)init NS_UNAVAILABLE;

hborders / ExampleTestsTestPrintExample.m

Last active March 13, 2017 16:51

An Objective-C pattern for making sum types - ExampleTestsTestPrintExample.m

	#import "Example.h" // https://gist.github.com/hborders/e00d7ff965ca8f8df8f7e762a2269efb
	#import "ExampleSwitcher.h" // https://gist.github.com/hborders/f378b4e0d0f1d74ff7c8149cb04c6268
	#import "ExampleFoo.h" // https://gist.github.com/hborders/094f05d932b3d7a1e389184ba525b0c3
	#import "ExampleBar.h" // https://gist.github.com/hborders/f1c231a89de11157adf46ee85880733a

	static void printExample(Example * _Nonnull example) {
	[example switchFoo:^(ExampleFoo * _Nonnull foo_) {
	NSLog(@"Foo: %@, %@", foo_.f, foo_.g);
	}
	bar:^(ExampleBar * _Nonnull bar_) {

hborders / ExamplePrivate.h

Last active March 13, 2017 16:26

An Objective-C pattern for making sum types - ExamplePrivate.h

	#import "Example.h" // https://gist.github.com/hborders/e00d7ff965ca8f8df8f7e762a2269efb
	#import "ExampleFoo.h" // https://gist.github.com/hborders/094f05d932b3d7a1e389184ba525b0c3
	#import "ExampleBar.h" // https://gist.github.com/hborders/f1c231a89de11157adf46ee85880733a

	@interface Example ()
	- (instancetype _Nonnull)initPrivate NS_DESIGNATED_INITIALIZER;
	@end

	@interface ExampleFoo()
	- (instancetype _Nonnull)initPrivate NS_UNAVAILABLE;

hborders / BadExampleEnum.swift

Created March 13, 2017 15:35

The swift compiler saves us from mismatching our enum types

	enum Example {
	case Foo(f: String, g: String)
	case Bar(b: Int, c: Int)
	}

	func printExample(_ example: Example) {
	switch example {
	case .Foo(let f, let g):
	print("Foo: \(f), \(g)")
	case .Bar(let b, let c):

hborders / BadExample.c

Last active March 13, 2017 15:26

An example of accidental union misuse of a C union with an enum tag to differentiate types

hborders / Example.c

Created March 13, 2017 15:14

A C union with an enum tag to differentiate types

hborders / ExampleEnum.swift

Last active March 13, 2017 15:29

A simple Swift enum example

	enum Example {
	case Foo(f: String, g: String)
	case Bar(b: Int, c: Int)
	}

	func printExample(_ example: Example) {
	switch example {
	case .Foo(let f, let g):
	print("Foo: \(f), \(g)")
	case .Bar(let b, let c):

hborders / TWFoundation.tree

Last active February 10, 2017 16:22

TWFoundation tree

	TWFoundation.podspec # the podspec that our Twitch iOS App and the TWFoundationHost project below consume
	TWFoundation
	├── Podfile # Configures TWFoundationHost and TWFoundationHostTests
	├── Podfile.lock
	├── Pods
	│ ├── ... # Pods stuff
	├── TWFoundation
	│ ├── NSArray+TWFoundation.h
	│ ├── NSArray+TWFoundation.m
	\| ├── ... # More TWFoundation classes

hborders / NSCFMutableSetWithOpaquePointersTests.m

Last active September 24, 2016 00:41

Shows that CFMutableSetRef doesn't transfer CFSetCallBacks to NSSet returned from setByAddingObject:

	#define HJBAssertNotSame(expression1, expression2, ...) \
	XCTAssert((expression1) != (expression2), \
	__VA_ARGS__)

	- (void)testCFMutableSetWithOpaquePointersCopiedToNSSetByAddingDoesNotKeepOpaquePointerBehavior
	{
	NSString * _Nonnull string1 = [@"ab" stringByAppendingString:@"cd"];
	NSString * _Nonnull string2 = [@"a" stringByAppendingString:@"bcd"];

	TWAssertNotSame(string1,

hborders / git_hash_from_cfbundleversion.bash

Created September 14, 2016 18:19

Convert a `CFBundleVersion` string constructed with `versions.bash` into a short revision of a git commit hash